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(6/7)*x = 120-((6/7)*x) // - 120-((6/7)*x)
(6/7)*x+(6/7)*x-120 = 0
12/7*x-120 = 0 // + 120
12/7*x = 120 // : 12/7
x = 120/12/7
x = 70
x = 70
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